My Man and I don't use the word "foreplay." It implies that stimulating the female's needs is secondary to the "Big Event" (evidently that is Penis in vagina sex.)
I've outlined the way we (and many other people) have sex before. We go back and forth between oral sex, toy play, touching, more oral sex, more PIV, rubbing, teasing, more oral sex, (usually some orgasms for me, then) more PIV, more oral, more PIV and maybe some anal. For instance this morning, I was taking a long time to come. "Sex" wasn't over as soon as he came. We then had more oral sex, then some more toy play and some anal play and more oral play with toys, and finally I came.
The word "foreplay" seems to me to imply that it is humoring the woman (assuming you're talking about a hetero relationship) until they get down to PIV.
We do anything and everything in any order, and then go back and do more of things we already did. So, it's common, usual in fact, for oral sex to follow PIV and orgasm for either or both of us. The whole thing, from the first touch or the first look is "sex." Nothing is "before" or "after" as HIS orgasm isn't the foremost thing in our sex play and sex doesn't necessarily end as soon as he comes. It ends when we're either both exhausted or chaffed.
Orgasms happen at any time during the act.
So, I can't really answer the question.